Transport and fixation means for load cells

Abstract

To provide conveyance fixing means for a measuring apparatus that uses a load cell.SOLUTION: A load cell 18 is part of a measuring apparatus 14, the measuring apparatus 14 including a base plate 15 and a balance tray 16, the load cell 18 including a load introduction area 19 joined to the balance tray 16 and a fixed area joined to the base plate 15. An open hole 21 is arranged to the base plate 15, the open hole 21 being matched to a threaded hole 22 of the load cell 18. The load cell 18 is attached to the base plate 15 by conveyance fixing means 25, the conveyance fixing means 25 including a sleeve 1 composed of many parts and at least one screw 24, the screw 24 including a screw head 27 and screw threads, with at least one open hole arranged to the sleeve 1, the sleeve 1 including at least one first sleeve element 2 and second sleeve element 3.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] FIELD OF THEINVENTION A transport and fixation means for a load cell, the load cell being part of a weighing instrument, the weighing instrument having a base plate and a balance pan, the load cell having a load introduction area connected to the balance pan and a fixed area connected to the base plate, the base plate having a through hole arranged therein that aligns with a threaded hole in the load cell, and the load cell being attached to the base plate by the transport and fixation means.

[0002] Background technology WO 2005 / 017470 describes a transport and fastening means for a load cell. The transport and fastening means consists of a number of individual parts. The production of such a transport and fastening means is expensive and the assembly is time-consuming.

[0003] overview It is therefore an object of the present invention to improve transport and fastening means for load cells in such a way that the disadvantages known from the prior art are eliminated or at least reduced.

[0004] This object is achieved in a transducer of the type mentioned at the beginning in that the transporting and fastening means comprises a multi-part sleeve and at least one screw, the screw having a screw head and a thread, at least one through hole being arranged in the sleeve, and the sleeve having at least one first sleeve element and a second sleeve element.

[0005] In another configuration, the sleeve has a cylindrical geometric shape, which allows it to be inserted through or into a through hole in the base plate.

[0006] In another embodiment, the sleeve is divided along the longitudinal axis into at least one first sleeve element and a second sleeve element, which facilitates the assembly or introduction of the sleeve into the through hole of the base plate.

[0007] In another embodiment, the first sleeve element has a central angle of at least 10°. The central angle or center angle relates to a center point of the sleeve. Preferably, the central angle is between 10° and 120°, preferably between 40° and 90°. This allows the first sleeve element to be easily inserted into and removed from the through hole of the base plate.

[0008] In another embodiment, the second sleeve element has a central angle of at most 350°. The central angle or center angle relates to the center point of the sleeve. Preferably, the central angle is between 240° and 350°, preferably between 270° and 320°. This allows the second sleeve element to be easily introduced into and removed from the through hole of the base plate.

[0009] In another configuration, the first sleeve element has an L-shaped geometric shape, the vertical leg being a part of a cylindrical sleeve and the horizontal leg being a spacer. This allows the horizontal leg of the first sleeve element to be inserted through the through-hole of the base plate and to be arranged between the base plate and the load cell without the need to remove the base plate or the load cell for this. In order to facilitate the introduction of the horizontal leg into the through-hole and to keep the size of the through-hole as small as possible, the horizontal leg at least partially has a smaller central angle than the vertical leg. Furthermore, the horizontal leg has a slope. This slope is preferably at an angle of 0.3° to 3°, particularly preferably at an angle of 0.8° to 2.5°, relative to the horizontal leg. The slope of the horizontal leg therefore allows the first sleeve element to be easily inserted between the load cell and the base plate. Due to the slope, jamming of the first sleeve element between the base plate and the load cell is also almost eliminated.

[0010] In another embodiment, the first sleeve element and / or the second sleeve element at least partially has a step on the outer circumferential surface, which serves for better fixing of the sleeve in the through hole and as a stop for the second sleeve element, so that the second sleeve element does not directly contact the load cell. For this purpose, at least a step of the second sleeve element rests on the edge of the through hole of the base plate.

[0011] In another configuration, the second sleeve element has a tapered geometric shape from the step to one end of the second sleeve element, which allows the second sleeve element to be easily inserted into the through hole and substantially eliminates binding of the second sleeve element.

[0012] In another embodiment, in the assembled state, a first gap exists between the first sleeve element and the screw head. The height of the first gap between the first sleeve element and the screw head is at least 20%, preferably at least 30%, particularly preferably at least 40% of the maximum bending of the load cell at rated load. The height of the first gap is the distance that exists between the first sleeve element and the screw head. This means, for example, that the load cell deflects by a maximum of 0.5 mm at a maximum rated load of 100 kg. Therefore, in this example, the first gap between the first sleeve element and the screw head must be at least 0.1 mm. This is the value that the load cell can be tightened without breaking.

[0013] In another configuration, in the assembled state, a second gap exists between the second sleeve element and the load cell, the height of the second gap between the second sleeve element and the load cell being at least 30%, preferably at least 40%, particularly preferably at least 50% of the maximum bending of the load cell at rated load. The height of the second gap is the distance existing between the second sleeve element and the load cell. The second gap serves to prevent the second sleeve element from contacting the load cell.

[0014] Thus, the second gap between the second sleeve element and the load cell is larger than the first gap between the first sleeve element and the screw head, which further results in the second sleeve element being shorter in the longitudinal direction than the first sleeve element.

[0015] In another embodiment, the load cell is fixed in the transport position by the sleeve in that a screw is inserted through the sleeve and fastened into the threaded hole of the load cell until the screw head rests force-lockingly on the first sleeve element, so that the load cell cannot move even in the event of a sudden crash load.

[0016] In another embodiment, the sleeve has a collar at least partially on its periphery. Preferably, the collar is arranged at least partially on the periphery of the first sleeve element and the second sleeve element. The collar serves for better handling of the sleeve element, since the sleeve element can be easily gripped and pulled out of the through hole.

[0017] Further advantageous aspects will become apparent from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram showing a first sleeve element and a second sleeve element. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 4 is a partial view of the meter shown in FIG. 3.

[0019] Detailed Description of the Preferred Embodiments 1 shows a schematic view of a first sleeve element 2 and a second sleeve element 3. The first sleeve element 2 and the second sleeve element 3 have a collar 4 at their upper ends. The collar 4 is arranged on the upper peripheral edge of the first sleeve element 2 and the second sleeve element 3. The wall thickness of the first sleeve element 2 and the second sleeve element 3 is at least 0.3 mm.

[0020] The first sleeve element 2 has an L-shaped geometric shape. The vertical leg 5 is a part of the cylindrical sleeve 1, and the horizontal leg 6 is a spacer 6. Preferably, the first sleeve element 2, in particular the vertical leg 5, has a central angle of 90°. The horizontal leg 6 has, at least in part, a smaller central angle than the vertical leg 5. For this purpose, the horizontal leg 6 has a first region 7. This first region 7 is arranged in the vicinity of the vertical leg 5 and has the same central angle as the vertical leg 5. A second region 8 is connected to the first region 7. This second region 8 has a smaller central angle than the first region 7 or the vertical leg 5. Furthermore, the horizontal leg 6 has a slope, which has an angle α of preferably 0.3° to 3° with respect to the horizontal leg 6.

[0021] The second sleeve element 3 preferably has a central angle of 269°. The first sleeve element 2 and the second sleeve element 3 have a step 9. Furthermore, the second sleeve element 3 has an upper section 10 having a cylindrical geometric shape and a lower section 11 having a tapered, conical or frusto-conical geometric shape.

[0022] FIG. 2 shows a schematic view of the sleeve 1 in the assembled state. The sleeve 1 comprises a first sleeve element 2 and a second sleeve element 3, which are separated from one another along their longitudinal axis. The sleeve 1 has a hollow cylindrical geometric shape. In the assembled state, the step 9 of the first sleeve element 2 and the step 9 of the second sleeve element 3 are preferably located at the same height. The second sleeve element 3 projects beyond the first sleeve element in an upper region 12 or at the collar 4, and the first sleeve element 2 projects beyond the second sleeve element 3 in a lower region 13. The height h of the horizontal leg 6 is preferably at least 0.2 mm.

[0023] 3 shows a cross-sectional view of the weighing device 14. The weighing device 14 has a base plate 15, a balance pan 16, a casing 17 and a load cell 18. The load cell 18 has a load introduction area 19 connected to the balance pan 16 and a fixed area 20 connected to the base plate 15. A through hole 21 is arranged in the base plate 15. The through hole 21 is aligned with a threaded hole 22 of the load cell 18. Additionally, a corresponding recess 23 may be arranged in the casing 17 which is aligned with the through hole 21 and the threaded hole 22.

[0024] The sleeve 1 is inserted through the through hole 21. For this, the first sleeve element 2 is first inserted through the recess 23 and through the through hole 21, with the horizontal leg 6 of the first sleeve element 2 being inserted between the load cell 18 and the base plate 15. The second sleeve element 3 is then inserted through the recess 23 and introduced into the through hole 21. Once the first sleeve element 2 and the second sleeve element 3 are positioned in the through hole, a screw 24, in particular a knurled screw 24, is inserted through the sleeve and screwed into the threaded hole 22 of the load cell 18. The threaded hole 22, into which the transport fastening means 25 consisting of the sleeve 1 and the screw 24 is screwed, is arranged in the load introduction area 19.

[0025] FIG. 4 shows a partial view of the weighing device 14 shown in FIG. 3. Only the load cell 18 and part of the base plate 15 as well as part of the casing 17 and the transport fastening means 25 can be seen in FIG. 4. In the assembled state, the step 9 of the second sleeve element 3 rests on the edge of the through hole 21. The edge of the through hole 21 preferably has a flange 26, on which the step 9 of the second sleeve 3 rests. The upper section 10 of the second sleeve element 3 thus has a larger radius than the through hole 21, and the lower section 11 of the second sleeve element 3 has a smaller radius than the through hole 21. Preferably, the first sleeve element 2 likewise has a step 9, which rests on the edge of the through hole 21 or on the flange 26 of the through hole 21.

[0026] In the assembled but untensioned state, the second sleeve element 3 rests against the screw head 27. A second gap 29 exists between the load cell 18 and the second sleeve element 3. In contrast, the first sleeve element 2 rests against the load cell 18 and a first gap 28 exists between the screw head 27 and the first sleeve element 2. The horizontal leg 6 is arranged between the load cell 18 and the base plate 15.

[0027] The screw 24 is tightened to fix the load cell 18 in position by the transport and fixing means 25. By means of the second sleeve element 3, which is supported on a flange 26 or edge of the through hole 21 of the base plate 15, the screw has a seat on which the screw 24 can be supported in order to fix the load cell 18 in position. During tightening, both the first gap 28 between the first sleeve element 2 and the screw head 27 and the second gap 29 between the second sleeve element 3 and the load cell 18 are reduced. An optimal tightening moment of the screw 24 is preferably achieved when the upper area 12 of the first sleeve element 2 rests against the screw head 27. The horizontal leg 6 of the first sleeve element 2 limits the maximum bending of the load cell 18, so that damage to the load cell 18 is precluded even in the case of too high a tightening moment. In particular, the load cell 18 is not mounted on the second sleeve element 3 in a clamped or fixed state, but rather a second gap 29 still exists between the second sleeve element 3 and the load cell 18.

[0028] Advantageously, the load cell 18 is provided with a through-threaded hole 22, into which a screw 24 of the transport fastening means 25 is screwed in at its underside and a mounting element for the balance pan 16 is screwed in from above. Alternatively, the threaded hole 22 can be a blind hole. [Explanation of symbols]

[0029] 1 Sleeve 2 First sleeve element 3 Second sleeve element 4. Brim 5 Vertical legs 6 Horizontal legs / spacers 7 First region First sleeve element 8 Second region First sleeve element 9 steps 10 Upper section second sleeve element 11 Lower section Second sleeve element 12 Upper Area 13 Lower Area 14 Measuring instrument 15 Base plate 16 Balance pan 17 Casing 18 Load Cell 19 Load introduction area 20 Fixed Area 21 Through hole 22 Threaded hole 23 Notch 24 Screws 25 Transport and fixing means 26 Brim Through hole 27 Screw head 28 The First Gap 29 The Second Gap

Claims

1. A transport and fixing means (25) for a load cell (18), The load cell (18) is part of a scale (14), the scale (14) having a base plate (15) and a balance pan (16); The load cell (18) has a load application area (19) coupled to the balance pan (16) and a fixed area (20) coupled to the base plate (15); The base plate (15) has a through hole (21) arranged therein that aligns with a threaded hole (22) of the load cell (18); The load cell (18) is attached to the base plate (15) by the transport and fixing means (25); The transport and fastening means (25) comprises a multi-part sleeve (1) and at least one screw (24), The screw has a head (27) and threads; At least one through hole is arranged in the sleeve (1), the sleeve (1) having at least one first sleeve element (2) and a second sleeve element (3), The first sleeve element (2) has an L-shape, The vertical legs (5) are part of the cylindrical sleeve (1) and the horizontal legs (6) are spacers (6).

2. A transport and fixing means (25) for a load cell (18), comprising:

2. 2. The conveying and fixing means (25) according to claim 1, characterized in that the sleeve (1) has a cylindrical shape.

3. 3. The conveying and fixing means (25) according to claim 1 or 2, characterized in that the sleeve (1) is divided along the longitudinal axis into at least one first sleeve element (2) and a second sleeve element (3).

4. 4. The conveying and fixing means (25) according to any one of claims 1 to 3, characterized in that the first sleeve element (2) has a central angle of at least 10°.

5. 5. The conveying and fixing means (25) according to any one of the preceding claims, characterized in that the second sleeve element (3) has a central angle of at most 350°.

6. 2. The transport and fastening means (25) according to claim 1, characterized in that the horizontal legs (6) at least partially have a smaller central angle than the vertical legs (5).

7. 7. The transport and fixing means (25) according to claim 1 or 6, characterized in that the horizontal legs (6) have a bevelled surface.

8. 8. The conveying and fixing means (25) according to claim 7, characterized in that the inclined surface has an angle (α) of 0.3° to 3°.

9. 9. The transport and fixing means (25) according to claim 1, 7 or 8, characterized in that the horizontal legs (6) are interposed between the load cell (18) and the base plate (15).

10. The transport and fixing means (25) according to any one of claims 1 to 9, characterized in that the first sleeve element (2) and / or the second sleeve element (3) have a step (9) at least partially on their outer circumferential surface.

11. 11. The transport and fixing means (25) according to claim 10, characterized in that the step (9) rests on the edge of the through hole (21).

12. The conveying and fixing means (25) according to claim 10 or 11, characterized in that the second sleeve element (3) has a tapered shape from the step portion (9) towards one end of the second sleeve element (3).

13. The transport fixing means (25) according to any one of claims 1 to 12, characterized in that in the assembled state, a first gap (28) exists between the first sleeve element (2) and the screw head (27).

14. The transport fixing means (25) according to claim 13, characterized in that the height of the first gap (28) between the first sleeve element (2) and the screw head (27) is at least 20% of the maximum bending of the load cell (18) at rated load.

15. The transport fixing means (25) according to any one of claims 1 to 14, characterized in that in the assembled state, a second gap (29) exists between the second sleeve element (3) and the load cell (18).

16. The transport fixing means (25) according to claim 15, characterized in that the height of the second gap (29) between the second sleeve element (3) and the load cell (18) is at least 30% of the maximum bending of the load cell (18) at rated load.

17. 17. The transport and fixing means (25) according to any one of the preceding claims, characterized in that the second sleeve element (3) is longitudinally shorter than the first sleeve element (2).

18. The transport fixing means (25) according to any one of claims 1 to 17, characterized in that the load cell (18) is fixed in a transport state by the sleeve (1) by inserting the screw (24) through the sleeve (1) and fastening it into the threaded hole (22) of the load cell (18) until the screw head (27) rests force-lockingly on the first sleeve element (2).

19. 19. The transport and fixing means (25) according to any one of the preceding claims, characterized in that the sleeve (1) at least partially on its periphery has a collar (4).

20. A transport and fixing means (25) for a load cell (18), comprising: The load cell (18) is part of a scale (14), the scale (14) having a base plate (15) and a balance pan (16); The load cell (18) has a load application area (19) coupled to the balance pan (16) and a fixed area (20) coupled to the base plate (15); The base plate (15) has a through hole (21) arranged therein that aligns with a threaded hole (22) of the load cell (18); The load cell (18) is attached to the base plate (15) by the transport and fixing means (25); The transport and fastening means (25) comprises a multi-part sleeve (1) and at least one screw (24), The screw has a head (27) and threads; At least one through hole is arranged in the sleeve (1), the sleeve (1) having at least one first sleeve element (2) and a second sleeve element (3), In an assembled state, a first gap (28) exists between the first sleeve element (2) and the screw head (27), A transport and fixing means (25) for a load cell (18), characterized in that the height of the first gap (28) between the first sleeve element (2) and the screw head (27) is at least 20% of the maximum bending of the load cell (18) at rated load.

21. A transport and fixing means (25) for a load cell (18), comprising: The load cell (18) is part of a scale (14), the scale (14) having a base plate (15) and a balance pan (16); The load cell (18) has a load application area (19) coupled to the balance pan (16) and a fixed area (20) coupled to the base plate (15); The base plate (15) has a through hole (21) arranged therein that aligns with a threaded hole (22) of the load cell (18); The load cell (18) is attached to the base plate (15) by the transport and fixing means (25); The transport and fastening means (25) comprises a multi-part sleeve (1) and at least one screw (24), The screw has a head (27) and threads; At least one through hole is arranged in the sleeve (1), the sleeve (1) having at least one first sleeve element (2) and a second sleeve element (3), A transport and fixing means (25) for a load cell (18), characterized in that in the assembled state, a second gap (29) exists between the second sleeve element (3) and the load cell (18).

22. A conveying and fixing means (25) as described in claim 21, characterized in that the height of the second gap (29) between the second sleeve element (3) and the load cell (18) is at least 30% of the maximum bending of the load cell (18) at rated load.

23. A transport and fixing means (25) for a load cell (18), comprising: The load cell (18) is part of a scale (14), the scale (14) having a base plate (15) and a balance pan (16); The load cell (18) has a load application area (19) coupled to the balance pan (16) and a fixed area (20) coupled to the base plate (15); The base plate (15) has a through hole (21) arranged therein that aligns with a threaded hole (22) of the load cell (18); The load cell (18) is attached to the base plate (15) by the transport and fixing means (25); The transport and fastening means (25) comprises a multi-part sleeve (1) and at least one screw (24), The screw has a head (27) and threads; At least one through hole is arranged in the sleeve (1), the sleeve (1) having at least one first sleeve element (2) and a second sleeve element (3), 10. A transport and fixing means (25) for a load cell (18), characterized in that the second sleeve element (3) is shorter in the longitudinal direction than the first sleeve element (2).

24. A transport fixing means (25) as described in any one of claims 20 to 23, characterized in that the load cell (18) is fixed in a transport state by the sleeve (1) by inserting the screw (24) through the sleeve (1) and fastening it into the threaded hole (22) of the load cell (18) until the screw head (27) is placed in a force-coupled manner on the first sleeve element (2).

25. A conveying and fixing means (25) as described in any one of claims 20 to 24, characterized in that the sleeve (1) has a flange (4) at least partially on its peripheral portion.

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